Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 37

(15) Outline of automatic operation
AUTO
HI
(a) Determination of operation mode
MED
LO
ULO
(15) Outline of automatic operation
(a) Determination of operation mode
(a) Determination of operation mode
Operation mode is determined by indoor air temperature and outdoor air temperature as following.
Indoor air temperature (˚C)
(b)
Indoor air temperature (˚C)
(b) Operation mode is changes when keep cooling and heating thermostat off 20 minutes and be satisfied with following conditions.
If the setting temperature is changed with the remote control, the operation mode is judged immediately.
(i)
(ii) When both the indoor and the outdoor air temperatures are in the range "A", cooling or heating is switched depending on
the difference between the setting temperature and the indoor air temperature.
(b)
(iii) When the operation mode has been judged following the change of setting temperature with the remote control, the hourly
judgment of operation mode is cancelled.
(i)
※It can not be changed to heating mode if outdoor air temperature is 28℃ or higher.
(c)
(ii) When both the indoor and the outdoor air temperatures are in the range "A", cooling or heating is switched depending on
(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is
the difference between the setting temperature and the indoor air temperature.
selected during heating, cooling or DRY mode, the unit is operated in the previous operation mode.
(d)
(iii) When the operation mode has been judged following the change of setting temperature with the remote control, the hourly
(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals
judgment of operation mode is cancelled.
of the wireless remote control and the setting temperature.
(c)
(d)
Cooling
Setting
temperature
Heating
(16) Protection control function
(a) Dew prevention control [Cooling]: Prevents dewing on the indoor unit.
(i) Operating conditions
Setting
temperature
When the following conditions have been satisfied for more than 30 minutes after starting operation.
1) Compressor's command speed is 28 rps or higher.
2) Detected value of humidity is 68% or higher.
12-110rps
12-110rps
12-88rps
12-72rps
12-40rps
27.5
25.5
18.0
SP
Indoor air
temperature (˚C)
27.5
25.5
Outdoor air temperature (˚C)
18.0
Keep operation
mode
Heating
SP － 1
Indoor air temperature－Setting temperature (˚C)
-6 -5
18 19
18 19
-6 -5
Cooling 18 19
Heating 18 19
A Dehumidifying
Cooling
Heating
Heating SP: Setting temperarure
18
Outdoor air temperature (˚C)
28
A
Heating
Cooling
18
SP: Setting temperature
Outdoor air temperature (˚C)
SP ＋ 1
Signals of wireless remote control (Display)
-4 -3 -2 -1
20 21 22 23
20 21 22 23
Signals of wireless remote control (Display)
-4 -3 -2 -1
20 21 22 23
20 21 22 23
36
- -
'19 • PAC-SM-334
Cooling
Cooling
30
Dehumidifying
30
±0
+1 +2 +3 +4
24 25 26 27 28
24 25 26 27 28
±0
+1 +2 +3
24 25 26 27
24 25 26 27
+5 +6
29 30
29 30
+4 +5 +6
28 29 30
28 29 30